Press-plate.



E. BENEDICTUS,

PRESS PLATE. APPLICATION FILED AUG. II I9I2.

I Paten-ned N0v.28, 1916.4

Fig. 1 Fig. 5

Fig. a Fig. I

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Envy/1 RD EEA/Emo' Tus t than EDOUARD BENEDICTUS, OF PARIS, FRANCE.

PRESS-PLATE.

Specification of Letters Patent. Patented NDV. 28, 1916.

Application tiled August 1,' 191%. Serial No. 712,732.

To all 'whom t may concern Be it known that I, EDOUARD BENneIo'rus, a resident of 25 Rue Fourcroy, at Paris, France, and a citizen of the Republic of France, have invented ful Improvements in Press-Plates, of which the following is a specication.

This invention has for an object lates for presses more particularly intende for the manufacture of glass strengthened or reinorced by the lnterposition between two sheets of glass, of sheets of celluloid, gelatin, Celluloid and gelatin or other similar materials by the processes described in the specifications of patent applications Benedictus, Serial Numbers 587,557

633,123 filed J une 14th 1911. y

The invention consists in imparting to these plates vor to one of them only, a shape slightly dished or convex so as to insure compression of the material extendin gressively from the' center tothe perip ery and thus to cause as completely as possible an expulsion ofthe liquids or fluids retained by the materials subjected to compression.

The invention consists moreover in furnishing the plates of the press with a mattressor cushioning device composed of. a

sucently pressible material such as cork, felt, caoutchouc, paper, etc., 'with a view to transmitting and at the same time moderatin or cushioning the forces of compression tgrom the dished or convex face of the plate to the plane surface of the glass and to prevent the breakage of the latter, when manufacture of strengt ened glass processes is ta V'ng place. Y

In the manufacture of glass of which the interposed material is of less dimensions those of the lass sheets, so that a mar.V gmal space is lei glass, 1t is expedient, in rorder to prevent breakage of the glass sheets at their edges, to determine in a precise manner the dimensions o the mattress made of elastic material. The dimensions of this mattress must be less than those of the glass sheets to be compressed and such that at the end of the compressing action'they attain bly their lateral 'expansion substantially to t ose of the interposed material between the glass sheets. Failingthis precaution, in effect, the sheets of glass which certain new and luseled JanuaryA 11th, 1910, 632,850 tiled vJune '13th 1911,

thick layer, of an elastic or compressure; l may alsomake use o according to the above at the periphery of the subjected to pressure, rst at a point project beyond the interposed material between the glass sheets, would be subjected to unsupported marginal strains, and would break. Y

Instead of employing plates of unvarying convex shape l may employ deformable plates of which the exterior face bends or yields in such a way that it can pass from the plane form, to the convex form and inversely. These plates are composed preferably of a thick unyielding portion comprising a conduit or passage allowing a Huid under pressure to escape, the exterior face of this thick part being covered by a sheet of metal or other flexible materiahxed in a fluid-tight manner at its periphery. 'llhe elasticity of the metal is suiiicient to enable me to obtain bends or curvatures some milli- I meters deep, such as those generally necessary in practice.i

The advantage 'of this arrangement consists in that it permits at the operation to commence the application of pressure from it progressively to the periphery so as` t0 insure the complete expulsion of the liquid and to allow of exerting at the finish a unin form pressure over the whole surfaceot the glass or other'bod ,submitted to ress'ure. i

To obtain the dishing or curving of the flexible face oit the plate, l may inject any fluid whatever (liquid, steam or as) under for the heating of the plate. j The plates may be furnished with cork or other elastic or compressible material as has been above stated.

ln the accompanying drawings, Figurel is a vertical section through press pletS 111 which my invention is illustrated in one form; Fig. 2 is a similar view of the same the beginning of the center, then to increase under pressure; Figs. 3 and e are views cor- .responding to Figs., 1V and 2 but illustrating the inventlon applied in a dierentmanner.

Referring to Figs. l and 2, the upper prem plate a carrieson its convexed lower face a mattress of v elastic material b, such as cork, felt, rubber or other suitable material.

' The face of the lower press plate a1, which is liat, is similarly'furnished with a mattress 1 identical with a1. As -will be readily understood, the sheetd of gelatin, which is conned betweenthe sheets c and c1 of lass, is

neath 1 the crown of the press plate a, while the pressure gradually spreads throughout the entire width of the mattress b as the latter is compressed by the downward movement of the plate.

In Figs. 3 and 4 the upper press plate e is hollow and its face comprises a ilegible sheet e1 which may be rendered .convex by the introduction of iuid through the passage f yin theshaft of thevpress. The lower press plate e2 is solid and fiat and the other ele-- ments of the illustration are likewise the same as in these Figs. l and 2. The operation of this press differs from vthat shown in Figs. 1 and 2, only in that here the face of the plate itself as well as the cushioning mattress iattens out under the action of the press. v 'n' y What I claim and desire to secure by Letters Patent of the United States is:

1 A press of the character described having upper and lower press plates, one of said plateshaving its face normally conveXed, in combination with cushioning mattresses on the faces ofysaid'- plates, said 'mattresses being susceptible of material lateral eXpansionin all directions under pressure, for the purpose described. Y

2. A press of the Character described, having upper and lower press plates, one of the said plates having its face permanently convexed, in combination with cushionmg mattresses on the faces of said plates, for the purpose described. y

3. vA press for compressing sheets of glass upon an interposed sheet of adhesive,-said press having upper and lower press plates, one/of said plates having its face normally convexed, in combination with cushioning mattresses on the faces of said plates, said mattresses being normally of less area than that of the adhesive sheet but expanding under operating pressure to substantially the area 'of the l.adhesive sheet, for the purpose described.

n testimony whereof I have signed my name t0 this specication, in the presence of two subscribing witnesses.

EDOUARD BENEDIQTUS.

Witnesses:

FERNAND SWANIQ LEN PEITTER. 

